Hello,
I see, there are different opinions. So, I will try to give you more details. First of all , the blade is not made from the sheet metal!
it is double edged blade made from resilient and quenched steel and it gives beautiful sound. It was etched from deep corrosion which covered it in the whole. That`s why it has got dark a bit.But the incrustation before was completely invisible. The blade is not flat at all, as it seems to be on the photos, but it is slightly cylindrical and it narrows to the edges. The carving on the hilt is not done mechanically, for sure! The specialist from minerals and rocks said that it was hand-made. He also claims that it has to be an old work because of the detrition which can be seen with the naked eye. Unfortunately , the photos don`t show it. It is jadeite for sure (so called jade) the scratch is white and the hardness points that it isn`t a nephrite, it is rare and worth. The problem is from what culture and period it comes from. I couldn`t find information about. The motifs are very original and unusual.
Tomorrow, I will give you more photos with high definition. I hope they will show much more to confirm what I`ve written above. It is difficult to take a good photo of it because it fades away, that`s why some attached photos have bigger contrast to show better the carving.
Thank you for your interests,
Alex.